Same issue here. A little research from these past post and it seems that my ABS is going out. No A/C, no tach, no speedometer, trifecta of lights, limp mode on a freshly built transmission, and not able to use the key to lock the doors(battery died in remote). She's parked for the moment. Just spent 4 grand on the trans.

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2001 X5 4.4
170,000 miles
Love our X and the way it keeps my wife and I safe and comfortable.